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REFRIGERATION

Troubleshooting

Fridge damaged after a voltage fluctuation

Voltage in many Indian markets swings well away from the nominal 230 V: deep sags in the evening peak, spikes when heavy loads drop off, and surges when supply returns after a cut. Refrigeration is sensitive to both ends. Low voltage makes the compressor draw more current and overheat while trying to start; high voltage and spikes stress electronics such as controllers, LED drivers and starting components. After a bad fluctuation, units often fail in a predictable order, from tripped protection that just needs a reset to a controller or compressor that needs replacing. Work through it calmly; repeated switching on and off can turn a small fault into a large one.

First, check these

  1. Switch the unit off at the socket and wait until the supply looks stable, for example lights steady and other appliances working normally.
  2. Check the MCB or RCCB on the circuit and any stabiliser or voltage protector. Many cut out on purpose and need a reset or a waiting period.
  3. Smell and look around the plug, socket, stabiliser and machine compartment for burning, scorch marks or melted plastic. If you find any, keep it off.
  4. Switch on once. Watch whether the display lights, the fans run and the compressor starts after any delay.
  5. If it runs, check the temperature recovers over the next hour or two.

Likely causes

  1. 1. Protection device tripped

    You can check this

    Signs: Stabiliser or voltage protector shows a fault light or no output; MCB in the off position.

    Fix: Reset as per the device instructions once the supply is stable. If it trips again immediately, stop and call an electrician or technician.

  2. 2. Controller or display damaged

    Technician job

    Signs: Display dead or showing random characters while the socket has power; fans and compressor do not respond.

    Fix: A technician must test and replace the controller or its power supply.

  3. 3. Start relay, PTC or capacitor damaged

    Technician job

    Signs: Compressor clicks and hums but will not run; overload cycling every few minutes.

    Fix: A technician replaces the starting components and checks the compressor. Do not let it keep clicking.

  4. 4. Fan motor or LED driver burnt

    Technician job

    Signs: One function dead after the event, such as no condenser fan, no interior fan or no lights, while the rest works.

    Fix: A technician should replace the failed part. If the condenser fan is dead, keep the compressor off to prevent overheating.

  5. 5. Compressor winding damage

    Technician job

    Signs: MCB or RCCB trips whenever the compressor tries to start; burning smell from the compressor area.

    Fix: A technician confirms with electrical tests. Compressor replacement is a sealed-system job.

  6. 6. Loose or damaged supply wiring

    Technician job

    Signs: Socket or plug warm, discoloured or loose; problem comes and goes when the cord is moved.

    Fix: Stop using the socket and have an electrician repair the wiring. A poor connection causes its own voltage drop.

When to call a technician

Call a technician if the unit does not run normally after one clean restart, if anything smells burnt, if protection trips again, or if only part of the unit works. Ask an electrician to check earthing and supply quality if fluctuations are frequent. Protect the replacement: a voltage protector with a restart time delay, or a stabiliser sized for the compressor's starting load, costs far less than a compressor.

Do not touch scorched plugs, sockets or wiring; isolate at the MCB first. Never bypass a stabiliser or protector to get a unit running. Starting components can hold a charge, so only technicians should open terminal boxes, and hydrocarbon (R290 or R600a) systems need trained technicians.

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